I have an old Hot Tub that isn't controlling it's temp. It will not stop heating and the temp will climb to 130*. I am new to the Hot Tub world and am asking if anyone can help. It's an older Hot Springs Spa, maybe 1988-1990? There is a stamp under the filter cover that reads, Prodigy HP - 03758. I am also looking for a book and the year it was made. The Local Hot Springs dealer hasn't been helpful and I can't seem to find any info on line about it.
Thank you in advance.
Adam